He completed his musical studies at the ''Agios Pavlos
Conservatory'' in Thessaloniki, Greece in Yannis
Papakrasas's class. In
2003
he graduated with the highest grade and the first Prize,
while in 2005 he was awarded the IKY scholarhip (Greek State
Scholarships Foundation) for musical studies.

In 2006 he graduated with distinction and honour from Mozarteum University in Salzburg, Austria. During his
bachelor degree he had the opportunity to be part of Eliot
Fisk and Ricardo Gallen's classes. In parallel, he studied
in the Landeskonservatorium Klagenfurt with Marco Tamayo, in
Mozarteum with Isabel Sieweres chamber and ensemble music, with
Simone Fontanelli and Martin Mumelter contemporary music and
with Howard Penny early music.

In 2009 he obtained his Masters degree with distinction and
honour from the same institution and he immediately became
Eliot Fisk's assistant at the Mozarteum University in
Salzburg, Austria.

Kostas won seven international prizes with the Miscelanea
Guitar Quartet, first prize in the Savarez-Corelli chamber
music competiton with the duo Tosidis-Nousis; fifth prize (the
2nd and 4th prizes were not awarded) in the ""Competition of
interpretation of Contemporary Music"" held at the Mozarteum
in Salzburg; and second prize in the ""Veria guitar
competition"" in Greece.

His soloistic projects include concerts in Austria, Greece,
Germany and Spain where he performed several contemporary
pieces such as: Cristobal Halffter's violin sonata, Gyorgy Ligeti 's Cello sonata
(arranged by Kostas Tosidis 2009),
Luciano Berio's Sequenza, Ton de Leeuw's Interlude, Marios
Joannou Elias's Maneuvre and many more; the latter was
dedicated to Kostas Tosidis . Kostas collaborated with the
Mozarteum University Orchestra under Dennis Russell Davies
and in the ""Patra International Music Festival"" with the
Modern Mandolin Orchestra under Pedro Chamorro .

Recently, he has recorded his first solo CD including four contemporary sonatas by
Alberto Ginastera, Cristobal Halffter, Gyorgy Ligeti ,
Tal Hurwitz and Atanas Ourkouzounov. Four of them have not been not recorded before.

Projects:
Kostas Tosidis is one of the founding members of the
renowned Miscelanea Guitar Quartet. Their aim was to create
a unique interpretation of original compositions for a
guitar quartet. The Quartet premiered important works in
concerts around Europe and in the USA. Their work is
acknowledged by famous 21st century composers, who already
have commissioned several musical pieces to the quartet, and
they collaborate with artists and dancers. ""Salzburg Concert"", released by the Spanish label Arsis, is the first CD of the Miscelanea Guitar Quartet.

Since September 2016 is a PhD candidate in the Royal Conservatory of Brussels.
His topic explores the possibilities of playing arrangements of contemporary pieces for cello, violin and viola on the guitar without losing the music’s intention or style. Translating scores originally composed for these orchestral instruments presents a challenge for any guitar arrangement, particularly when trying to find technical solutions for the use of the bow.
As part of this thorough study on the guitar technique in relation with contemporary compositional techniques , he plans to include a detailed essay combined with a DVD with technical examples and practical exercises.

His doctorate research will conclude with commissioned works by composers such as Atanas Ourkouzounov, Marios Joannou Elias, Feliu Gassul, Marko Dottlinger and Giannis Papakrassas.

Although most of Kostas's time is dedicated to the Quartet, he works continuously with the composer
Marios Joannou Elias. Kostas has premiered most of his work for solo guitar and chamber music. He is currently recordingMarios Joannou Elia's portrait CD (forthcoming in 2014) as the main soloist and member of the Miscelanea Guitar Quartet and other chamber music formations.The recording was in ORF Wien, Austria.

Kostas plays a guitar built by Alector Guitar, uses Knobloch Strings and a guitar rest by Ergoplay.